/*********************************************************************************/
/* Copyright (c) 2010 Serge A. Zaitsev                                           */
/*                                                                               */
/* Permission is hereby granted, free of charge, to any person obtaining a copy  */
/* of this software and associated documentation files (the "Software"), to deal */
/* in the Software without restriction, including without limitation the rights  */
/* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell     */
/* copies of the Software, and to permit persons to whom the Software is         */
/* furnished to do so, subject to the following conditions:                      */
/*                                                                               */
/* The above copyright notice and this permission notice shall be included in    */
/* all copies or substantial portions of the Software.                           */
/*                                                                               */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR    */
/* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,      */
/* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE   */
/* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER        */
/* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, */
/* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN     */
/* THE SOFTWARE.                                                                 */
/*********************************************************************************/

#ifndef __JSMN_H_
#define __JSMN_H_

#include <stddef.h>

/* Include the parent links so we can more easily traverse the JSON structure. */
#define JSMN_PARENT_LINKS

#ifdef __cplusplus
extern "C" {
#endif

/**
 * JSON type identifier. Basic types are:
 *     o Object
 *     o Array
 *     o String
 *     o Other primitive: number, boolean (true/false) or null
 */
typedef enum {
    JSMN_UNDEFINED = 0,
    JSMN_OBJECT = 1,
    JSMN_ARRAY = 2,
    JSMN_STRING = 3,
    JSMN_PRIMITIVE = 4
} jsmntype_t;

enum jsmnerr {
    /* Not enough tokens were provided */
    JSMN_ERROR_NOMEM = -1,
    /* Invalid character inside JSON string */
    JSMN_ERROR_INVAL = -2,
    /* The string is not a full JSON packet, more bytes expected */
    JSMN_ERROR_PART = -3
};

/**
 * JSON token description.
 * type        type (object, array, string etc.)
 * start    start position in JSON data string
 * end        end position in JSON data string
 */
typedef struct {
    jsmntype_t type;
    int start;
    int end;
    int size;
#ifdef JSMN_PARENT_LINKS
    int parent;
#endif
} jsmntok_t;

/**
 * JSON parser. Contains an array of token blocks available. Also stores
 * the string being parsed now and current position in that string
 */
typedef struct {
    unsigned int pos; /* offset in the JSON string */
    unsigned int toknext; /* next token to allocate */
    int toksuper; /* superior token node, e.g parent object or array */
} jsmn_parser;

/**
 * Create JSON parser over an array of tokens
 */
void jsmn_init(jsmn_parser *parser);

/**
 * Run JSON parser. It parses a JSON data string into and array of tokens, each describing
 * a single JSON object.
 */
int jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
        jsmntok_t *tokens, unsigned int num_tokens);

#ifdef __cplusplus
}
#endif

#endif /* __JSMN_H_ */
